Mixing ATF-DW-1 and ATF-Z-1

I am about to change the ATF. Bought a crate of ATF-DW-1. Apparently, Honda changed the fluid name (constituents also?) from ATF-Z1 to ATF-DW-1. I hear that the new fluid can be used on old Vs and old and new are compatible and can be mixed.

Short answer is it's backward compatible BUT Z1 is not approved for use in 2011 or newer.

"Honda parts stock has a new ATF available. It's called ATF DW-1 and it replaces ATF Z1. It’s been designed to improve transmission performance when it’s cold, which helps with fuel economy. ATF DW-1 is the factory fill for all ’11 Honda models. Eventually it will be our only ATF, but you can keep using ATF-Z1 in all ’10 and older models for now. However, make sure that you DO NOT use ATF-Z1 in any ’11 and newer models.

Another question. Is it better to do the "drain-fill" thrice on the go or do it over a few days? In other words, how much should I drive between each "drain-fill" event?

Roadster - I haven't yet opened to carton yet. Will let you know when I do. Hopefully it is red.
bechtoea - Thanks. Good to know about the backward compatibility. Anyway, maybe I am the guinea pig this time
CurlyQ - Thanks for the link to Fuelly. Really useful.

I am about to change the ATF. Bought a crate of ATF-DW-1. Apparently, Honda changed the fluid name (constituents also?) from ATF-Z1 to ATF-DW-1. I hear that the new fluid can be used on old Vs and old and new are compatible and can be mixed.

Search provides no leads on DW-1.

Any thoughts?

Thank you!
Gopal

DW-1 is too new to have much info on it as of right now but it is supposed to be backward compatible just like the new DPFII is.

It's a personal call on your part but I would just do a single drain and fill and call it a day unless you are way over due and need to do a 3X drain and fill.

As far as the procedure for a 3X, you just need to drive it long enough for the transmission to go through all the gears before doing #2 and #3. It would be a more complete job if you can spread it out over a few days but that would depend on the availability of time you have. One drain and fill right after another will do the job as long as you make sure you go through all the gears to make sure the new fluid has a chance to go through all the passage ways.

i would get it up to a high enough speed to lock up the torque converter. so for me that's usually going to work (too many kids and dogs around to go that fast around the block LOL). so i would do a drain and fill every weekend for 4 weeks.

I last changed it @82K and it was 3x "drain-fill", with intervening drive around the block (top speed @~60mph). Now I am at 97K, just over 15K miles. I'll settle with a 1x, unless the fluid looks too dark.

I was wondering if the Gen 1 too needs shifter-cable lube? If so, would WD-40 do the job?

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